---
title: "CVE-2026-30880: baserCMS has OS command injection vulnerability in installer"
url: https://erroneo.us/security/cve/CVE-2026-30880/
description: "CVE-2026-30880 (baserproject/basercms (Composer (PHP))): baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has an OS command…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-31
date_modified: 2026-03-31
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-30880"
kev: false
cvss: 9.2
epss: 0.02248
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-30880: baserCMS has OS command injection vulnerability in installer

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 2.2% , percentile 83: FIRST’s model estimates a 2.2% chance of exploitation activity in the next 30 days, higher than 83% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes baserproject/basercms (Composer (PHP)) <= 5.2.2, fixed in 5.2.3 . Check your lockfile, including transitive dependencies.

## What it is

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has an OS command injection vulnerability in the installer. This issue has been patched in version 5.2.3.

## Affected packages

- Composer (PHP) `baserproject/basercms` <= 5.2.2 → fixed: 5.2.3

## Affected products (CVE record)

- baserproject basercms: < 5.2.3

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 2.25% probability of exploitation activity in the next 30 days; percentile 83.

## Sources

- [GitHub Advisory GHSA-6hpg-8rx3-cwgv](https://github.com/advisories/GHSA-6hpg-8rx3-cwgv)
- [CVE.org record CVE-2026-30880](https://www.cve.org/CVERecord?id=CVE-2026-30880)
- [NVD entry CVE-2026-30880](https://nvd.nist.gov/vuln/detail/CVE-2026-30880)
- [github.com](https://github.com/baserproject/basercms/security/advisories/GHSA-6hpg-8rx3-cwgv)
- [basercms.net](https://basercms.net/security/JVN_20837860)
- [github.com](https://github.com/baserproject/basercms/releases/tag/5.2.3)

---
Source page: https://erroneo.us/security/cve/CVE-2026-30880/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt